How to save any file as a PDF

Step-by-step instructions for creating PDFs from any file type, including methods for merging, compressing and password-protecting PDF documents securely.

I thought I was loyal to NotebookLM — until this app came along

But static has always been the operative word. The PDF has been a destination and a final state. That was the case until ...

If you use inverted camera controls, you might rotate shapes in your mind more slowly—but more accurately!—according to a recent neuroscience study

Specifically, there was a strong correlation between inversion preference and how quickly the subject could mentally rotate a ...